Center "Leave a reply" in Twenty Eleven

Hi! I have created a child for the Twentyeleven theme.

Could anyone kindly inform me how to move the “Leave a reply” (under each post) to the center? I have removed all other meta data under the posts.

I have found that both the date on top of the entry and the “Leave a reply” moves to the center if I do the following in the CSS:

.entry-meta, .entry-meta a {
text-align: center;

I would like the date to remain to the the left (top) and only move the “Leave a reply” to the center (bottom).

Thanks in advance!